Automatic calling device



July 15, 1924. 1,501,281

, J H. H. IDE

AUTOMATIC CALLING DEVICE 7 Original Filed April 9, 1920 2 Sheets-Shee'tED517707? 5527; if [0"5.

7 July 15, 1924.

w. H. H. IDE

AUTOMATIC CALLING DEVICE Original Filed April 9, 1920 2 Sheets-Sheet 2Eva- 277027 Patented July 15, 1924.

LSLZti HARRY H. IDE, 0F LA GRANGE, ILLINOIS, ASSIGNOR TO KELLOGGSWITCHBOAR-D AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

AUTOMATIC CALLING DEVICE.

Application filed .April 9, 1920, Serial To all 'whom z't may concern:

Be it known that L'HARRY H. Inn, a citizen of the United States ofAmerica, residing in La Grange, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Automatic CallingDevices, of which the following is a specification.

My invention relates to calling devices and has todo more particularlywith calling devices such as are. commonly used in telephone systems forcontrolling automatic switches which are located at the central officeby directive impulses to extend a connection from a calling substationto a. called substation through the agency of the said switches. I

My invention is particularly adapted to operate in conjunction with theso-called metallic or two-wire type of automatic circuits in which thecircuit of the line is interrupted a number of times, determined by theadjustment of the setting member of the calling device. The principalobject of my.

invention is to provide a device of. the char acter described which willbe certain and efiicient in operation, simple in construction andeconomical to manufacture.

A feature of my invention is the provision of means whereby, upon theadvance movement of the setting member or dial, the cam or wing memberwhich. interrupts the impulse springs is prevented from rotatingbackward and separating the said impulse springs. Another feature of myinvention relates to the governor mechanism which permits therestoration of the setting mem ber or dial from an advanced position ata predetermined speed. Still another feature of my invention relates toa floating ratchet mechanism which connects the setting member or dialto the impulse controlling means. A still further feature of myinvention resides in the manner I arrange the gears of the speed-up geartrain and in the manner I enclose said gears in-a dust-proof casing toprotect them against foreign matter.

The above features, aswell as others, and advantages herein describedwill-be better understood upon reference to the following specification,taken in connection with the accompanying drawings, and the scopeof theinvention will beparticularly pointed outin the appended claims, i

Referring now-more particularly to the No. 372,525. Renewed March 5,1923.

accompanying drawings, in which Iillustrate the calling device in theseveral views and in which views like reference characters indicate likeparts, and in which Fig. 1 is a face view of the callingdevice of myinvention;

Fig. 2 is a rear view of Fig. 1;

Fig. 3 is a right side view of Fig. 2;

Fig. 4 is a top view of Fig. 2;

Fig. 5 is a bottom view ofF-igJQwith certain parts broken away;

Fig. 6 is a sectional view along the. line 66 of Fig. l;

Fig. 7 is a sectional view along the line.

77 of Fig. 2; V Fig. 8 is a view similar to Fig. 6 but showing themechanism in an advanced position; Fig. 9 isa sectional view along theline 9-9 of Fig. 4;

Fig. 10 is a disassembled perspective view of the main shaft and partswhich are mounted thereon;

Fig 11 is a sectional view of the governor along the line 1111 of Fig.4;

Fig. 12 is a perspective view of the tension spring of the governor.

Referring now more in detail to my invention as illustrated in theaccompanying drawings, it comprises a main mounting plate 2 providedwith a forwardly extending rim 3 for purposes as will be 'more fullyhereinafter described. A main shaft at ex tends through a bearing 5which is secured to the. mounting plate 2 in any suitable manner. Afinger hold actuating member 6 is secured to the forward end of the mainshaft 4 by means of a screw 7, which screw has screw-threaded engagementwith a suitable" tapped orifice in the main shaft 4. The forward end ofthe shaft 4 is cut away to form a squared portion, and the finger holdactuating member 6 is provided with an opening shaped to receive the.forward end o of the shaft 4. The squared port-ion of the shaft l:secures the finger hold actuating member 6 against rotation on the shaft4 when it is being advanced fromits normal position. V

The finger hold actuating memberfi' is provided with a plurality ofopenings or finger holds 8, preferably ten in number. A member 9 forenclosing the mechanism is provided with a forwardly extending cupportion 10 and a flanged portionll which is provided with a backwardlyextending rim portion 12. The diameter of the rim orifices in the lugs14 which are secured to the flanged portion 11 of the member 9 in anysuitable manner.

Indicating numerals are placed upon the flanged portion 11 of the member9 in any suitable manner and the number of said numerals correspondingwith the number of finger holds 8. The ten openings 8 which form thefinger holds are numbered 1, 2, 3, etc., to 0, and the calling device isadapted to send from one to ten impulses. The finger hold actuatingmember 6 is provided with a card holder in the form of a clamping ring15, and the card held in place by the ring 15 may bear any legend. Thescrews 7 which secures the member 6 upon the shaft 4 also holds theclamping ring 15 and card against displacement. A stationary finger stop16 is secured to the mounting plate 2 by means of screws 17,

so that when the finger hold actuating mem ber 6 is advanced in aclockwise direction, the advancing finger of the operator engages thestationary finger stop 16, and arrests further movement of the actuatingmember.

Referring now more particularly to the operating mechanism, the mainshaft 4 eX- tends through a suitable bearing sleeve 5 secured to themounting plate 2 and a hearing sleeve 18 which is secured to thebridgeplate 19 in any suitable manner, the said shaft 4 rotating in thesaid bearings 5 and 18. A sleeve 20 is provided, which is of a size toreceive the shaft 4, the said sleeve 20 when in place resting againstthe hearing 5. A spiral motor spring 21 is coiled around the bearing 5and the sleeve 20 and the end 22 of the spring 21 engages one of aplurality of lugs 23, which lugs 23 are preferably integrally formedwith the mounting plate 2 by means of a shearing and forming operation.Anarm 24 is provided which has a square orifice 25 of a size to receivethe square portion 26 of the shaft 4 and is held in place by means of ascrew 27, which has screw-threaded engagement with a suitable tappedopening in the end of the shaft 4. The arm 24 is provided withan angularextension 28, which extension 28 forms a securing means for the end 29of the motor spring 21, the said end 29 being hook-shaped so as topermit it being hooked over the said extension 2-8. The spring 21restores the finger hold actuating member 6 to its normal position afterthe same has been advanced, and then released, and the arm 24 operatesthe shunt springs and also serves to retain the motor spring 21 in placeabout the bearing 5 and sleeve 18. To secure the proper tension of themotor spring 21, the end 22 of the spring 21 is moved in a clockwisedirection over the lugs 23 until the proper tension or adjustment issecured. The end 22 of the spring 21 is then placed so that it engagesone of the plurality of lugs 23, to thus hold the spring 21 under itsnormal tension and also hold the finger hold actuating member 6 in itsnormal po sition.

The member 9 is provided with a central-- ly located orifice 30 in thecup portion 10 and is of a size to permit the passage of the main shaft4. Positioned directly beneath the cup portion 10 of the member 9 on themain shaft 4 is a combined stop and dog 31 which is secured to the saidshaft 4 in any suitable manner as by means of a staking operation. Thedog 31 is provided with two arms 32 and 33, diametrically opposite eachother, and co-operates with a floating ratchet 34 loosely mounted uponthe main shaft 4 and positioned directly beneath the said dog 31. Thefloating ratchet 34 is provided with a plurality of teeth or wings 35and is spring-pressed into engagement with the dog 31 by means of aspiral spring 36. Positioned directly beneath the ratchet 34 is a gearwheel 37 provided with a central orifice 38 of a size to permit it beingslipped over the sleeve 18 secured to the bridge plate 19, the said gearwheel 37 being loosely supported upon the said sleeve 18. An annulargroove 39 is cut in the face 40 of the gear wheel 37 and is of a size toreceive a portion of the spiral spring 36. The said spring 36 surroundsthe shaft 4 and when it is in position with a portion resting in theannular groove 39, it is thus positioned against displacement. hen theratchet 34 and gear wheel 37 are positioned as just described, thetension of the coil spring 36 is such that the ratchet 34 isspring-pressed in an upward direction into engagement with the dog 31 sothat arms 32 and 33 of the dog 31 each engage a tooth or wing 35 of thesaid ratchet 34. The ratchet 34 is provided with depending lugs or arms41 and 42, preferably integrally formed therewith, the said arms 41 and42 extending down into orifices 43 and 44, in the gear wheel 37. Thefunction of the dog'31 and ratchet 34 and arms 41 and 42 co-operatingwith the gear wheel 37 will be more fully hereinafter described.

A gear wheel 45 is also provided and is suitably secured to a shaft 46,which shaft 46 is journaled between the bridge plate 19 and a bearing 47which is secured to the plate 2, the said bridge plate 19 being securedto the mounting plate 2 by means of screws 48, 49 and 50, which screwspass through suitable openings in the bridge plate 19 and havescrew-threaded engagement with suitable tapped orifices in the mountingplate 2. A pinion 51, formed integrally with the shaft 46, meshes withthe gearv wheel 37, the said shaft 46 also carrying the interrupter cam52'wl1ich cooperates with the impulse springs 53 and 54, as will be morefully hereinafter described. A shaft 55 is provided and is journaledbetween the bridge plate 19 and a bearing 56 secured to the mountingplate 2. The shaft 55 is provided with a pinion 57 integrally formedwith the shaft 55 and which meshes with the gear wheel'45. The shaft 55.is associated with the governor mechanism G, which is adapted to retardthe return movement of the finger hold actuating member 6 at apredetermined speed, as will be more fully hereinafter described.

To retain the finger hold actuating member 6 in its normal positionagainst the tension of the motor spring 21, I provide any arm 58integrally formed with the dog 31, which is permanently secured to theshaft 4, the said arm 58 being provided with an angular extension 59which is normally in engagement with the pinion 51 of shaft 46. Shouldthe finger hold actuating member 6be advanced in a clockwise direction,the nose of'the angular extension 59 disengages the pinion 51 due to thefact that the dog 31 is rotated with the shaft 4 when the member 6 isrotated in a clockwise direction. When the finger hold actuating member6 is released and restored in a counter-clockwise direction by the motorspring 21, upon restoration to normal the nose of the extension 59 isagain brought into engagement with the pinion 51. This engagementwit-lithe pinion 51 by the nose of the extension 59 also prevents anoverrun operation of the impulse mechanism.

The governor mechanism comprises the shaft 55 which has a pinion 57formed integrally with it, as hereinbefore mentioned, the said pinionmeshing with the gear wheel 45 upon the shaft 46. The shaft '46 has apinion 51 integrally formed with it, which pinion 51 meshes with thegear wheel 37 upon the shaft 4. The train of gearing thus outlinedconnects the governor mechanism G with the main shaft 4. A'member 56 isstaked to the mounting plate 2 and serves as a bearing for the shaft 55,and also'serves as a braking surface for the weighted members 60 and 61.The weighted members 60 and 61 of the governor are pivotally sup? portedon the bridge plate 62 by means of the pivot pins 63 and.64. The end 65of the shaft 55 is threaded to receive the bridge plate 62 which isprovided with a suitable tapped orifice which has screw-threaded engagement with thesaid threadedendj65 of the shaft 55, thus rotatablysecuring the governor mechanism as a whole to the mounting plate.

A plate 66 of comparatively thin metal is provided, and formedintegrally with the plate 66 area pair of looped spring members 67 and68 provided :with depending spring arms 69 and 70 diametrically oppositeeach other. The plate 66 isprovided with a slot 71 of a sizeto permitits being slipped over the shaft 55. The depending arms 69 and 7 0engage, respectively, weighted members 60 and 61, and the said plate 66is held in place by means of the nut 72, which has screwthreadedengagement with the threaded end 65 of the shaft 55. The action of thetension of spring members 67 and 68 upon weighted members 60. and 61 maybe lessened or increased, thereby decreasing or increasing the speed ofthe governor mechanism.

The slot 71in the plate 66' permits lateral movement of said plate 66when adjusting the governor to balance up thespring tension on theweighted members 60 and 61.

The governor mechanism G is-operatively associated with the train ofgearing before mentioned, and when the finger hold actuating member 6 isrotated in a clockwise direction to set the calling device to transmit acertain number of impulses,the gear 37 and floating ratchet-34 which areloosely mounted upon the shaft 4 remain stationary while the shaft 4 anddog 31 are operated in a clockwise direction so that the arms 32, 33 and58 ride over the teeth or wings 35 of the floating ratchet 34 until thearms 32 and 33 rest in the desired teeth of the floating ratchet 34.Upon the return movement of the finger hold actuating member 6' and theshaft 4, the dog 31 also returns therewith, due to its being securedtothe shaft 4, and as the arms 32 and 33 ofthe dog 31 now engage thedesired tooth 35 of the ratchet 34,

the said ratchet 34 is rotated in a counterclockwise direction, anddueto the depending arms 41 and 42 of ratchet 34 extending into orifices43 and 44 in the gear wheel 37, the said gear 37 is rotated therewith,and

through the medium of thetrain of gearing the motion is transmitted tothe governor mechanism G. The-shaft 55 is now rotated,

weighted members 60 and61 cause the piv-' oteden'ds of the members '60and 6l'to be forced against the member 56- and, due .to the engagingsurfaces of'the weighted mem bers 60 and 61 being infclose proximity tothe fulcrum of the weighted members 60 and 61, the weight of the saidmembers is multiplied in forcing the engaging surfaces of the saidweighted members 60 and 61 against the periphery of the member 56. Amember 120 is provided with a central orifice for receiving the shaft 55and also provided with a shoulder portion 121 which fits down into slot71 of plate 66 and secured in place by means of the nut 72 havingscrewthreaded engagement with the threaded end portion of shaft 55. Theshoulder portion 121 is such as not to permit rotation of plate 66relative to member120, but to permit only lateral movement of plate 66relative to member 120. The shoulder portion 121 is slightly greater inthickness than the plate 66 so that when nut 7 2'is tightened, the plate66 is held against rotation but not against lateral movement. The slot71 in the plate 66, as before mentioned, permits lateral movement of thesaid plate member 66 so that, should there be a slight difference oftension between the spring members 67 and 68, it is overcome bypermitting the plate 66 to move slightly either way, depending upon thetension of the said members 67 and 68, thus equalizing the tension ofthe spring members 67 and 68. To increase or' decrease the speed ofrotation of the calling device, the nut '72 is loosened and the member120 and plate 66 rotated in one direction or the other to increase theaction of the spring tension or to decrease the action of the springtension, whichever the case may demand, upon the weighted members 60 and61.

In order to operate the impulse springs 53 and 54 of the calling device,I prefer- I ably provide an interrupter cam member 52 of insulationmaterial, mounted upon a sleeve 75. The sleeve is provided with a tappedopening extending therethrough, the said sleeve 75 having screw-threadedengagement with the threaded end 76 of the shaft 46. A nut 77 isprovided which has screw-threaded engagement with the threaded end 76 ofthe shaft 46 and secures the said cam 52 in place upon the shaft 46.

The floating ratchet 34, hereinbefore described, has a plurality ofteeth or wing '35, twelve in number, but I only use ten of these wings35,- as I only have the finger holds 8 numbered froml to 0, having aspace equal to two finger holds 8 upon the member 6. normal, the arms 32and 33 of the dog 31 each engage a wing 35 of the ratchet 34, and as thearms 32 and 33 are diametrically opposite each arm, they engage wings 35diametrically opposite each other. A por tion of each wing 35 of theratchet 34 is 'angularly displaced in relation to the plane face of theratchet 34, and the edge 7 8 of the wings 35 engages, respectively, theedge 7 9 of the arm 32 and the edge of the arm hen the member 6 is at-33 of dog 31. Now when the member 6 is rotated in a clockwise direction,the arms 32 and 33 ride over the successive wings 35 of the ratchet 34in its advance movement, and as the arms 32 and 33 pass over thesuccessive wings 35 of the ratchet 34, the said ratchet 34 is forceddown against the normal tension of the spiral spring 36, which spring 36holds the ratchet in its float-- ing position in engagement to the arms32 and 33 of the said ratchet 34. Upon this advance movement of themember 6, the arm 58 also rides over the wings 35 of the ratchet 34, andthe nose of the angular extension 59 of arm 58 also disengages pinion51. When the finger hold actuating member 6 is moved in a clockwisedirection, the tension of the coil spring 36, which holds the ratchet 34in its floating position, is such that it tends to hold the ratchet 34in engagement with the arms 32 and 33 of the dog 31, thus tending tocarry the loosely mounted gear 37 (if the spring tension is sufficient)with the ratchet 34 and thereby rotate the train of gearing and cammember 52. This backward movement of the gear train is prevented by alatch spring secured to the impulse spring support 86. The cam member 52is provided with notches 87 diametrically opposite each other, and thenose of the latch spring 85 engages a notch 87 of the cam 52, thuspreventing this preliminary movement. A slightly greater movement thanthat required to operate the impulse springs 53 and 54 a number oftimes, dependent upon the number of impulses to be sent, is given member6, due to the position of the finger stop 36, and this slightly greatermovement just described is given so that, upon the return movement ofthe device, the arms 32 and 33 will engage the proper wing 35 of theratchet 34. This is so arranged that a positive action is obtained andso that the desired impulses are always transmitted.

A pair of normally closed impulse springs 53 and 54 are provided, whichare interrupted according to the number of impulses to be transmitted bythe interrupter or cam member 52. The impulse springs 53 and 54 are sospaced that the cam member 52 rests between the springs 53 and 54 towardtheir extremities, the free ends of the said springs 53 and 54 beingformed, as illustrated in Fig. 2, to form a pair of normally closedimpulse springs. The springs 53 and 54 are insulatingly mounted upon thesupport 86, which is secured to the mounting plate 2 by means of thescrews 88.

Now, if the actuating member 6 is rotated in a clockwise direction, thedog 31 moves with the shaft 4 and the arms 32 and 33 ride over the wings35 of the ratchet 34 due to being loosely mounted upon the shaft 4. Uponthe return movement of the shaft 4 and dog tween the arms 41 and 42 ofratchet 34 and gear wheel 37, and the said gear wheel37 isthen rotatedin a counter-clockwise direction, due to the motorspring 21, therebytransmitting power to the pinion 51 which meshes with the gear-37,{thusrotating the shaft 46 upon which the cam member .52 is secured,bringingabout the-opening and closing of the impulse contacts53 and 54 anumber of times, according. to'thenumber of impulses to besent. 1

The gearingratio is such that for every thirty degrees that the gearwheel 37 is rotated, the shaft 46 is rotated one hundred and eightydegrees so that, if eightimpulses are to'be sent and-the dial set,-up'onthe 7 return movement of'theshaft 4 andinember 6 the gear wheel 37 willtravel through two hundred and forty degrees of rotation, thus causingfour complete revolutions of the shaft 46, and as the cam member 52 isprovided with wings 90 and 91, diametrically opposite, the fourrevolutions of-the shaft 46 cause-the wing member 90 to engage eachspring 53 and 54 fourti-mes and wing member 91 to engage each spring 53and 54 fourtimes, thus bringing about the opening and closing ofimpulse'springs 53' and 54 eight times.

I also provide shunt springs 'by'whichthe subscribers apparatus may beshort-circuited while the impulses are being transmitted. v

The shunt springs comprise a pair of normally open contact springs 92and 93, t he spring 92 being'conductively connected w th the impulsespring 53, the said springs 92 and 93 being also mounted upon the sup"-port 86. Vhen the calling device is at normal, the arm 24 secured to theshaft 4 engages an insulation buffer 94 mounted upon the-extension 95 ofthe spring 92 and holds the shunt springs 92 and 93 normally disengaged.lVhen the member 6 is moved off normal, the'shaft 4 is rotated and thearm 24 moves therewith, disengaging the buffer 94, allowing the shuntsprings 92 and j 93 to close and remain in suchposition until the arm 24again engages buffer '94 upon the completion of the returnmovement ofthe setting member. I p

I provide angular extensions 95, which are integrally formed with thebridge plate 19, the said angular extensions 95 extending throughsuitable openings 96 in the plate 2 and serve as means for fastening thedial to the instrument.

I will now describe briefly the operation of the device. Let us assumethat the-subscriber wishes to effect four operations of the'impulsecontacts 53 and 54, that is, to transmit four impulses, the finger ofthe subscriberwill be inserted into a finger hold 8 before the member 4andthe member 6 is rotated in a clockwise direction until the finger ofthe subscriber engages the stationary stop 16. The rotation ofthe memher 6 also causes the rotation ofthe shaft 4 and dog 31 and thernose ofthe angular extension 59 of arm 58 of dog 31 to disengage the pinion 51.A. slight movement,-'as already described, of the mecha I nism isbrought'about, but is arrestedwhen the nose of the latch spring85engages a notch 87 of the cam member52. The floating ratchet 34 andgear-37 are looselymounted; upon the shaft" 4, and therefore upon thisforward movement the arms 32 and 33 of the dog 31 ride over the wingsi35of'the ratchet 34, thus allowing the ratchet 34 and gear 37 to remainnormal. As the shaft 4 leaves normal upon its forward rotation, thevarm24 =carried thereby disengages the rubber buffer 94of the shuntspring192, allowing the shunt springs 92' and'93-toclose their contactsto short-circuit the substation apparatus. The adjustmentof the; member6 winds up themotor spring 21 sothat-when the finger of the subscriberisreinoved-from the finger hold 8 of the actuating:member 6, the spring21restorestheshaft 4 and dog 31 tonormal. The arms 32 and 33 of the dog31 engage edges"78 of wings35 and, due to the connection between theratchet 34 -and.gear:37'by'armsl4l and 42, thegear 37 is rotated withthe said ratchet 31. This motion of the gear 37 is transmitted to thegovernor mechanism G through the agency of the train of gearing, thusipermitting the restoration ofthe calling deviceat a predeterminedspeeds Motion is also transmitted to the shaft 46 to bring. about therotation of-the cam member 52, causing impulse contacts53 and 54 tobe'interrupted four times to transmit four impulses of current to thecentral office to operate the central ofiice switch apparatus; Upon thereturn to normal of the'devioe, the nose of the extension 59'of arm 58of .dog .31 again engages a tooth of the pinion 51, thereby immediatelyarresting further rotation of the cam member 52. The arm.24 againengages the rubber buffer 94 mounted upon the spring 92,-thus'interrupting the shunt springs 92 and 93: The device is now at normaland is again ready to be adjusted to effect the transmission ofanother'set' of impulses;

In illustrating my invention,- I= have shown a specific form ofapparatus, but I do not wish to be limited to the exact structure asshown, as-many. modifications and changes may readily, suggestthemselves to those skilled in the art, and, therefore, I aim to" coverallfisuchchanges and modifications ascome within the spirit and scope ofthe appended claims.

.Having described my invention what claim as new and desire to secure byUnited States Letters Patent is:

1. A calling device including a mounting plate, a. pinion shaft carriedby said mounting plate, an interrupter secured to said pinion shaft, asetting member for controlling said interrupter, driving mechanismincluding a floating ratchet member supported by said mountingplateconnecting said setting member to said interrupter via the said pinionshaft, a dustproof cover-cap for enclosing said mechanism, and a numberplate carried by said cover cap.

2. A calling device comprising a circular mounting plate having aperipheral flange, interrupter contacts secured to the rear face of saidplate, an interrupter for operating said contacts, a setting member,mechanism including a speed-up train of gearing secured to said mountingplate and adapted for connecting said setting member to said interarupter, and acircular dustproof cover provided with adownwardlyextending peripheral flange adapted to fit within the peripheral flange of said mounting member for enclosing said mechanism.

3. A calling device including a mounting plate, a pinion shaft carriedby said mounting plate, an interrupter secured to said pinion shaft, adisk like setting member provided with a plurality of orifices for controlling said interrupter, mechanism supported by said mounting plateconnecting said setting member to said interrupter via said pinionshaft, a dustproof cover-cap for enclosing said mechanism, and a numberplate carried by said dustproof cover be neath said setting member.

4. A device of the character described in eluding a mounting plate,interrupter springs secured to said mounting plate, an interrupterextending through the mounting plate for operating said interruptersprings, a governor secured to the rear of said mounting plate, a numberplate, a setting member, mechanism connecting the setting member to saidgovernor and said interrupter, and a cover for enclosing all of saidmechanism and forcarrying said number plate.

5. A calling device including a mounting plate, a mounting member, amain shaft and an interrupter shaft having bearings in said mountingplate and said mounting member, and lugs formed integrally with saidmounting member adapted for use in securing the calling device inposition.

6. A calling device including a mounting plate, a supporting memberconnected to said mounting plate, a main shaft and an interrupter shafthaving bearings in said mounting plate and in said supporting member,

' and lugs formed integrally with said supporting member extendingthrough orifices scribed provided With a mounting plate having acircular peripheral flange, impulse springs, a pinion, an interruptersecured to said pinion for operating said springs, a setting member, aspeed-up train of gearing mounted upon said mounting plate andconnecting said setting member to said interrupter via said interrupterpinion, and a cover-cap provided with a circular peripheral flangeadapted to fit within the flange of said mounting plate enclosing saidspeedup train of gearing.

9. A calling device including a mounting plate, a supporting tripodsecured to said mounting plate, a main shaft and a governor shaft bothhaving bearings in said mounting plate and said supporting tripod, and adustproof cover enclosing said supporting tripod.

10. A calling device including a mounting plate, a supporting membersecured to said mounting plate, a main shaft having bearings in saidmounting plate and said supporting member, a pawl firmly secured to saidshaft, a loosely connected gear supported by said shaft, a ratchetloosely connected to said shaft, and a spring member for yieldinglyholding said ratchet in contact with said pawl.

11. A calling device including a mounting plate, a supporting membersecured to said mounting plate, a main shaft having bear ings in saidmounting plate and said supporting member, a pawl firmly secured to saidshaft, a loosely connected gear supported by said shaft, a ratchetloosely connected to said shaft, a spring member for yieldingly holdingsaid ratchet in contact with said pawl, and a setting member forrotating said main shaft and pawl whereby said pawl ineffectively passesover the teeth of said ratchet.

12. A calling device including a mounting plate, a supporting tripodsecured to said mounting plate, a main shaft having bearings in saidmounting plate and said supporting tripod, a pawl firmly secured to saidshaft, a loosely connected gear supported by said shaft, a ratchetloosely connected to said shaft, a spring member for yieldingly holdingsaid ratchet in contact with said pawl, and a setting member forrotating aid main shaft and pawl whereby said pawl inefiectively passesover the teeth of said ratchet so that when the setting member isreleased said pawl engages the teeth of said ratchet and transmitsmotion to said gear. V

13. A device of'the character described including a mounting plate, amain shaft supported'by said mounting plate, a pawl secured to said mainshaft and having oppositely extending arms, a gear loosely" supportedupon said main shaft, a ratchet loosely connected to said main shaft andprovided with peripherally formed teeth, and a spring member foryieldingly holding said ratchet in engagement with said pawl.

14-. A device of the character described including a mounting plate, amain shaft supported by said mounting plate, a pawl secured to said mainshaft and having oppositely extending arms, a main gear looselysupported upon said main shaft, a ratchet loosely supported upon saidmain shaft and provided with peripherally formed teeth, a setting memberfor moving said pawl in a clockwise direction whereby its oppositelyextending arms inelfectively pass over the peripherally formed teeth ofsaid ratchet and a spring member for yieldingly holding said ratchet inengagement with said pawl, whereby when the setting member is releasedthe oppositely extending arms of said pawl engage teeth of the ratchetand rotate the said gear.

15. A device of the character described including a mounting plate, amain shaft supported by said'mounting plate, a pawl secured to said mainshaft and having oppositely extending arms, a gear loosely supportedupon said main shaft, a ratchet loosely connected tosaid main shaft andprovided with peripherally formed teeth, a spring member for yieldinglyholdingsaid ratchet in engagement with said pawl, a setting member formoving said pawl in a clockwise direction whereby its oppositelyextending arms ineffectively pass over the peripherally formed teeth ofsaid ratchet, an interrupter contact geared to said gear whereby whenthe setting member is released the oppositely extending arms of saidpawl engage teeth of the ratchetand rotate the said gear, therebyoperating said interrupter, a governor for regulating the returnmovement of said setting member, and a motor spring for returning saidsetting member to normal.

16. A calling device of thecharacter de-- shaft, and an integrallyformed arm for said'tripod forming a bearing for said gear shaft. a

s 17. -A calling device of the character de scribed including a mountingplate, a supporting member connected to said mounting plate, a mainshaft having bearings in said supporting member and said mountingplate,an interrupter and a pinion mounted upon a shaft having hearings in saidmounting plate and said supporting member, a shaft having bearings insaid mounting plate and said supporting member, a governor and a pinionsecured to said second shaft, a gear supported on saidmain shaft in meshwith said pinion on the interrupter shaft, and adriving gear on theinterrupter shaft in mesh with said pinion on the governor shaft.

18. A calling device of the character described including a mountingplate, a supporting member connected to said mounting plate, a mainshaft having bearings in said supporting member and said mounting plate,a shaft having bearings in said mounting plate and said supportingmember, an interrupter and a pinion secured to said second shaft, agovernor and a pinion secured to a shaft having bearings in saidmountingplate and said supporting member, a gear supported on said main shaft inmesh with said pinion on the interrupter shaft, a driving gear on theinterrupter shaft in mesh with said pinion on the governor shaft, asetting member secured to said main shaft, and ratchet and pawlmechanism connecting said main shaft to the gear supportedon the mainshaft.

19. A calling device of the character described including a mountingplate, a supporting member connected to said mounting plate, a mainshaft having bearings in said supporting member and said mounting plate,a shaft having hearings in said mounting plate and said supportingmember, an interrupterand a pinion secured to said second shaft, agovernor and a pinion secured to a shaft having bearings in saidmounting plate and said supporting member, a gear supported on said mainshaft in mesh with said pinion on the interrupter shaft, a driving gearon the interrupter shaft in mesh with said pinion on the governor shaft,a pawl firmly secured to said main driving shaft, a ratchet looselysecured to said main shaft for cooperation with said pawl, and a coverfor enclosing said gears and pinions.

20. A calling device of the character de scribed including 'a mountingplate, a supporting member connected to said mounting plate, a mainshaft having bearings in said supporting member and said mounting plate,a shaft having bearings in said mounting plate and said supportingmember, an

interrupter and a pinion secured to said second shaft, a governor and apinion securedto a shaft having bearings in said mounting plate and saidsupporting member, a gear supported on said main shaft in mesh with saidpinion on the interrupter shaft, a driving gear on the interrupter shaftin mesh with said pinion on the governor shaft, a pawl firmly secured tosaid main driving shaft, a ratchet loosely secured to said main shaftfor cooperation with said pawl, and integrally formed members for saidratchet connecting said ratchet to said main driving gear.

21. A calling device provided with a mounting plate, a supporting membersecured to the face of said mounting plate, a main shaft having bearingsin said mounting plate and supporting member and ex- 1 tending throughsaid mounting plate, a motor spring connected to said main shaft, a maindriving gear loosely connected to said main shaft, ratchet and pawlmechanism connecting said main shaft to said main driving gear, aninterrupter shaft having bearings in said mounting plate and saidsupporting member and extending through said mounting plate, a pinion,on said interrupter shaft in mesh with said main driving gear, adriving gear connected to said interrupter shaft, a governor shafthaving bearings in said mounting plate and said supporting member andextending through said mounting plate, a pinion for said governor shaftin mesh with the driving gear on the interrupter shaft, and a dustproofcover for enclosing said gears andpinions.

22. A calling device provided with a mounting plate, a supporting membersecured to the face of said mounting plate, a main shaft having bearingsin said mount ing plate and supporting member and extending through saidmounting plate, a motor spring connected to said main shaft, a maindriving gear loosely connected to said main shaft, ratchet and pawlmechanism connecting said main shaft to said main driving gear, aninterrupter shaft having bearings in said mounting plate and saidsupporting member and extending through said mounting plate, a pinion onsaid int-errupter shaft in mesh with said main driving gear, a drivinggear connected to said interrupter shaft, a governor shaft havingbearings in said mounting plate and said supporting member and extendingthrough said mounting plate, a pinion for said g0v ernor shaft in meshwith the driving gear on the interrupter shaft, a dustproof cover forenclosing said gears and pinions, and iiitegrally formed lugs for saidsupporting member extending through orifices in said mounting plateadapted to be used to secure the calling device in position.

23. A calling device including a mounting plate, a supporting membersecured to said mounting plate, a main shaft having bearings in saidmounting plate and said supporting member, a pawl connected to said mainshaft having oppositely extending arms, a driving gear loosely connectedto said main shaft, a ratchet loosely connected to said main shaft andhaving dependent members extending into orifices in said driving gear,and a spring partially supported in an annular groove in said drivinggear for maintaining said ratchet in engagement with said pawl.

24;. A calling device including a mounting plate, a supporting membersecured to said mounting plate, a main shaft having bearings in saidmounting plate and said supporting member, a pawl connected to said mainshaft having oppositely extending arms, a driving gear loosely connectedto said main shaft, a ratchet loosely connected to said main shaft andhaving dependent members extending into orifices in said driving gear, aspring partially supported in an annular groove in said driving gear formaintaining said ratchet in engagement with said pawl, and a memberformed integrally with said pawl for preventing an overrun operation ofsaid driving gear.

25. A calling device including a mounting plate, a supporting membersecured to said mounting plate, a main shaft having bearings in saidmounting plate and said supporting member, a pawl connected to said mainshaft having oppositely extending arms, a driving gear loosely connectedto said main shaft, a ratchet loosely connected to said main shaft andhaving dependent members extending into orifices in said driving gear, aspring partially supported in an annular groove in said driving gear formaintaining said ratchet in engagement with said pawl, a member formedintegrally with said pawl for preventing an overrun operation of saiddriving gear, a dustproof cover for enclosing said mechanism andprovided with a numerical disc, and a setting member for controllingsaid main shaft.

26. A calling device including a mounting plate, impulse mechanismincluding an accelerating gear train supported by said mounting plate, adustproof cover-cap adapted to be secured to said mounting plate forenclosing said accelerating gear train, a setting member for operatingsaid gear train and impulse mechanism, and a supporting member havingbearings for said impulse mechanism and gear train and adapted to securesaid devices in position.

27. A calling device including a mounting plate, an interrupter and ashaft for the same secured to said mounting plate, a disklike settingmember provided with a plurality of orifices for setting saidinterrupter to produce a certain number of interruptions,

a dust-proof casing secured to said mounting plate, and gear mechanismpositioned between said casing and mounting plate for operativelyconnecting said interrupter and said setting member to effect operationof said interrupter when said setting member is operating.

28: A calling device including a mounting plate, a shaft secured in saidmounting plate, an interrupter secured to said shaft, a setting member,impulse springs controlled by said interrupter, gear mechanism includinga floating ratchet for operatively associating said setting member andinterrupter via said shaft, whereby said setting member is operable tocause said interrupter to interrupt said impulse springs 'apredetermined number of times, and a dust-proof casing for enclosingsaid gear mechanism.

29. A calling device including a mounting plate, impulse springs,interrupter mechanism for controlling said impulse springs, a settingmember, gear mechanism including a floating ratchet for operativelyassociating said interrupter mechanism with said setting member wherebysaid setting member is adapted to control the operation of saidinterrupter mechanism to interrupt said impulse springs a certain numberof times, governor means for causing said impulse springs to beinterrupted at constant intervals, and a casing secured to one side ofsaid mounting plate to enclose the parts of said device on that side ofthe mounting plate.

30. A calling device including a mounting plate, impulse springs, aninterrupter for interrupting said impulse springs, a shaft for saidinterrupter, a setting member, gear mechanism including a floatingratchet for operatively associating said setting member and saidinterrupter via said shaft, said setting member operable in onedirection to determine the number of times said impulse springs are tobe interrupted by said interrupter, and operable in the oppositedirection to permit the interruption of said impulse springs thepredetermined number of times, and a dust-proof casing for enclosingsaid gear mechanism.

Signed by me at Chicago, in the county of Cook and State of Illinois,this 7th day of April, 1920.

HARRY H. IDE.

